On 11/29/2015 03:33 PM, Tomas Vondra wrote:
Hi,
On 11/29/2015 02:38 PM, Craig Ringer wrote:
I've had a few tries at implementing a qemu-based crashtester where it
hard kills the qemu instance at a random point then starts it back up.
I've tried to reproduce the issue by killing a qemu VM, and so far I've
been unsuccessful. On bare HW it was easily reproducible (I'd hit the
issue 9 out of 10 attempts), so either I'm doing something wrong or qemu
somehow interacts with the I/O.
Update: I've managed to reproduce the issue in the qemu setup - I think
it needs slightly different timing due to the VM being slightly slower.
I also tweaked vm.dirty_bytes and vm.dirty_background_bytes to values
used on the bare hardware (I suspect it widens the window).
regards
--
Tomas Vondra http://www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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